Drawing glass



W. J. WOODS DRAWING GLASS Oct. 27, 1931. v

Filed April 9. 1929' 4 Sheets-Sheet l EFL; r.

INVENTOR w/LL/AM J 0006 ATTOZNEY Oct. 27, 1931. I w WOODS 1,829,429

DRAWING GLASS Fil ed April 9, 1929 Sheets-Sheet 2 INVENTOR W/l. IAN JFY0006.

Oct. 27, 1931. w, J, WOODS. 1,829,429

DRAWING GLASS Filed April 9, 1929 4 Sheets-Sheet 3 INVENTOR- W/ 04/10."W000i @z. ATTORNEY W. J. WOODS DRAWING GLASS Oct. 27,1931.

Filed April 9, 1929 4 Sheets-Sheet 4 INVENTOR WILL/AM J. FY0006. BY

-AT ERNEY Patented Oct. 27 1931 I UNITED STATES PATENT OFFICE WILLIAM J.WOODS, OF CORNIN G, NEW YORK, ASSIGNOR TO CORNING- GLASS WORKS,

7 OF CORNING, NEW YORK, A. CORPORATION OF NEW YORK nnnwme GLASSApplication filed April 9, 1929. Serial K0 3535590.

This invention relates to a method of and means for producing drawnglass and more particularly to the production of small bore tubing withthick walls having a lens front and, if desired, a stripe of coloredglass on its rear wall.

To accomplish these ends, I provide a cooled nipple immersed below thesurface of molten glass and means by which the glass may be drawn fromabove the'nipple. In-

colored glass into the tube as the draw takes place and also theconstruction, combination,

and arrangement of the severahparts which will be hereinafter fullydescribed "and claimed.

In the drawings:

Fig. 1 is a side view in elevation of an apparatus embodying myinvention and adapted to carry out the process herein disclosed;

Fig. 2 is a top plan view of Fig. 1; 1

Fig. 3 is a vertical sectional view taken on the line 3-3 of Fig. 2, thesuperstructure being omitted; Y

Fig. 4 is a transverse sectional view taken on the line H'of. Fig. 2,the superstructure being omitted;

Fig. 5 is a fragmentary sectional view similar to Fig. 3 illustratingthe parts on a greatly enlarged scale;

Fig. 6 is an enlarged fragmentary sectional view similar to Fig. 4; p

. Fig. 7 is a top plan view of the boot and its supporting elementsillustrated in Fig. 6;

Flg. 8 is a horizontal sectional view taken;

1 on the line 8--8 of Fig. 5;

Fi 9 is an inverted perspective view of the s aper; Y

Fi 10. is an inverted perspective view of the rame used for confiningthe colored glass; I I

Fig. 11 is a top plan view of the shaper showing beneath it acoolednipple of the type used in the production of tubing hav- 1 ing acircularbore; Fig. 12 is aview similar to F ig. 9illustrat ing the typeof nipple used in the production of tubing having a flat bore; and iFig. 13 is a sectional view front striped tube, by my improved methodandapparatus.

The bath of'glass from which the tubing is drawn is, by preference,contained within a: suitable basin or tank 2, which, in turn,isconthrough a lens tained Within a suitable heating structure 3.

In the form shown, the bath one which is adapted to be replenished fromtime to time by ladling fresh glass therein, the glass being fed to thebasin through the opening 4 in the top of the heating structure.Inserted upwardly in the bottom of the basin 2 is a nipple 5 whicharises within the glass within thebasin but which preferably, as shown,does not such as may be produced a des1red extent by means of an airinduction pipe 6.

cooperating edged wheel 8 which is driven 1n any suitable manner and ata desired speed. Formed in the heating structure 3 directly above thenipple 5 is an opening 4 through which a boot 10 is introduced into thebasin 2. The lower edge of the boot 10 is positioned slightly above theglass in the basin and is provided with an inturned flange 11 for apurpose to be more 'fully hereinafter described.

Supported on the inturned flange 11, at the lower edge of the boot 10,is a shaper 12 which, in the manufacture of lens front tubing, has atriangular portion 13, the lower edge of which is immersed below thesurface of the glass. This shaper is preferably made of a heat resistingalloy not subject to attack by J molten glass. vThe boot 10 extends up-"wardly through the opening 4 in the top wall of the furnace structureand is provided at its upper end with an out-turned flange 15 whichrests upon a vertically adjustable ring 16 which is also shiftablymounted on the Located above'the t'op of'the structure 3 70 extend abovethe surface of the bath. This nippleis hollow and is adapted to becooled to scribed, glass having been put into the basin 'until itslevel-is abeve the lower edge of the shaper 12, the drawing of glass isstarted by immersing the end of a bait in the glass over the nipple anddrawin this upwardl until the resultant column of glassis threa edbetween the "feed rolls 7 and 8, which are in rotation to continue thedraw. It will be an opening. 27 through which air is admittedv foundthat theshaper serves to give the desired cross sectional shape to theresultant body of glass,'the drawing taking place from the cooled glassover the nipple and within the shaper. If it is desired to fabricatetubingythelieadof the nipple is provided with into the interior of thebody of glass being formed. 7 v a By shifting-the position of thedrawing rolls 7 and 8 laterally, 'the position of the bore within thetube may be varied, and by shifting the shaper 12 axially in respect tothe nipplepit will be found that the size of the bore in the resultanttubing may be varied, that is, the greater the separation bef tween thenipple 5 and the. shaper 12, the smaller will be the bore produced.Hence, I am enabled bymy invention to mechanically produce lens frontcapillary tubing having bores of varying sizes.

In-certain cases, it may corporate in the tubing 'a stripe of coloredglass which, in lens front tubing, is generally placed back of the bore.This, I find, may

be accomplished by forming a cut away portion 14 in the lower edge ofthe shaper and laying a narrow layer 28 of colored glass ,upon thesurface of the body of flint glass in the basin 2 adjacent to the cutaway portion. During the drawing,'this colored glass will move into thecut away'portion as a ribbon and be fed upwardly through the shaperduring ,the drawing operation so that it forms -2,1 employed. .Thisframe is formed a stripe of colored glass in the resulting tub- 1n Inorder to reserve the relation of the colored glass striping in thetubing and guide the operator in supplying additional colored glass, aframe 17 having its lower edge submerged below the level of the glass inthe of a: suitable refractory material preferably fhalving a ifi gravityless than the bath f glass and consists of a pail 0f Side wallsconnected at one end by a curved be desirable to inwall 20, which isadapted to fit the curvature of the back of the shaper, while theopposite ends of the walls 18 and 19 and the lowerv edge of thispartition wall is cut away as at 23 to facilitatethe flow of the glassfrom the chamber 24 formed between the wall 21 and the partition walltoward the point of draw. The latter is only employed when it is desiredto draw tubing having a colored back overlaid with flint or aglass ofanother 'color. The curved wall 20 is also cut away at 25 so that itslower edge registers with the lower edge of the cut away portion 14 ofthe shaper 12 to facilitate the flow of the glass from the chamber 26toward the point of draw. In order to secure tubing. having a coloredback, colored glass is introduced into the chamber 24 and floated on thesurface of the clear glass in the basin 2, and clear glass is introducedinto the chamber 26r As the draw takes'place, the glass in the chamber24 will a be drawn along the surface of the glass in the basin 2 towardthe point of draw and the clear glass in the chamber 26 will also bedrawn over the surface ofthe colored glass toward the point of draw. Inthis manner,

the tubing which is being drawn will have a laminated back consisting ofcolored and clear glass, with the clearglass surrounding the coloredglass. See Fig. 13. I

As the cut away portion of the shaper is opposite the V-shaped portionthereof, the stripe will be magnified when the tubing is giewed throughthe lens front behind the ore. I In this specification and claims, flintand colored glass are used to designate any two glasses capable of beingcojointly drawn.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent is:

1. The hereinbefore described method of I making drawn glass whichcomprises form- Inc ing a horizontally narrow layer of colored glass ina bath of flint glass and drawing up wardly from such two glasses. a

2. The hereinbefore described method of drawing glass having a coloredstripe which comprises forming a relative narrow layer of colored glassin a bath of flint glass andconjointly drawing the two glasses upwardly.through a shaping element projectlng into the glass.

3. The hereinbefore described method of upwardly drawing glass whichcomprises forming a narrowerlayer of colored lass in a bath of the flintglass and drawing the "colored glass beneath an element immersed in theglass.

4. The hereinbefore described method of.

making drawn capilliary glass tubing which comprises drawing glassupwardly from a bath of molten glass and over a cooling nipple locatedbelow the surface of the bath.

5. In an apparatus for drawing glass tubing, the combination with acontainer for a bath of molten glass, a nipple located in the bath, ashaper projecting into the bath above the nipple and means for drawingglass from the bath from within the shaper.

6. In an apparatus for drawing glass tubing, the combination with acontainer, for a bath of a molten glass, a nipple located in the bath, ashaper projectlng into the bath above the nipple, means for shifting theshaper laterally in respect to the nipple, and means for drawing glassfrom the bath from within the shaper.

7 In an apparatus for drawing glass tubing, the combination with acontainer for a bath of a molten glass, a nipple located in the bath, ashaper projecting into the bath above the nipple, means for varying theimmersion of the shaper in the bath and means for drawing glass from thebath from within the shaper.

8. In an apparatus for drawing glass tubing, the combination with acontainer for a bath of a molten glass, a nipple located in the bath, ashaper pro ecting into the bath above the nipple, means for shifting theshaper laterally in respect to the nipple and vertically .inthe bath andmeans for drawing glass from the bath from within the shaper. I

9. In an apparatus for drawing glass tubing, the combination with acontainer for a bath of a molten glass, a nipple located in the bath, ashaper projecting intothe bath above the nipple, the lower edge of theshaper having a restricted cut away portion, and means for drawing glassfrom the bath from within the shaper.

10. In an apparatus for drawing glass tubing. the combination with acontainer for a bath of a molten glass, a nipple located in the bath, ashaper projecting into the bath above the nipple, the lower edge of theshaper having a restricted cut away portion, means for shifting theshaper laterally in respect to the nipple, and means for drawing glassfrom the bath from within the shaper.

11. In an apparatus for drawing glass tubing. the combination with acontainer for a bath of a molten glass, a nipple located in the bath, ashaper projecting into the bath above the nipple, the lower edge of theshaper having a'restricted cut away portion, means for varying theimmersion of the shaper in the bath and means for drawing glass from thebath from within the shaper 12. In an apparatus for drawing glasstubing, the combination with a bath of a molten glass. a nipple locatedin the bath, a shaper projecting into the bath above the nipple, thelower edge of the shaper having a restricted cut away portion, means forshifting the shaper laterally in respect to the nipple and vertically inthe bath, and means for drawing glass from the bath from within theshaper.

13. In an apparatus for drawing glass tubing, the combination with acontainer for a bath of a molten glass, a nipple located in the bath, ashaper projecting into the bath above the nipple, the lower edge of theshaper having a restricted cut away portion, a frame projecting into thebath and having its side walls disposed near the ends of the cut awayportion of the shaper and means for drawing glass from the bath fromwithin the shaper.

14. In an apparatus for drawing glass, the combination with a containerfor a bath of molten glass, means for drawing glass from the bath, meanssubmerged below the surface of the glass for shaping it as it is drawnand means for-coolin that portion of the glass from which the raw takesplace, of a frame within the container for receiving glasses of adifferent character and retainin them in a restricted zone on thesurface 0 the lass bath in such a position that when the raw takes placeall glasses will be drawn simultaneously.

WILLIAM J. WOODS.

